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      Superlubricity through graphene multilayers between Ni (111) surfaces

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      Author
      Cahangirov, S.
      Çıracı, Salim
      Özçelik, V. O.
      Date
      2013
      Source Title
      Physical Review B - Condensed Matter and Materials Physics
      Print ISSN
      2469-9950
      Electronic ISSN
      2469-9969
      Publisher
      American Physical Society
      Volume
      87
      Issue
      20
      Language
      English
      Type
      Article
      Item Usage Stats
      158
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      Abstract
      A single graphene layer placed between two parallel Ni(111) surfaces screens the strong attractive force and results in a significant reduction of adhesion and sliding friction. When two graphene layers are inserted, each graphene is attached to one of the metal surfaces with a significant binding and reduces the adhesion further. In the sliding motion of these surfaces the transition from stick-slip to continuous sliding is attained, whereby nonequilibrium phonon generation through sudden processes is suppressed. The adhesion and corrugation strength continues to decrease upon insertion of the third graphene layer and eventually saturates at a constant value with increasing number of graphene layers. In the absence of Ni surfaces, the corrugation strength of multilayered graphene is relatively higher and practically independent of the number of layers. Present first-principles calculations reveal the superlubricant feature of graphene layers placed between pseudomorphic Ni(111) surfaces, which is achieved through the coupling of Ni-3d and graphene-π orbitals. The effect of graphene layers inserted between a pair of parallel Cu(111) and Al(111) surfaces is also discussed. The treatment of sliding friction under the constant loading force, by taking into account the deformations corresponding to any relative positions of sliding slabs, is the unique feature of our study. © 2013 American Physical Society.
      Permalink
      http://hdl.handle.net/11693/20960
      Published Version (Please cite this version)
      http://dx.doi.org/10.1103/PhysRevB.87.205428
      Collections
      • Department of Physics 2329
      • Institute of Materials Science and Nanotechnology (UNAM) 1831
      • Nanotechnology Research Center (NANOTAM) 1026
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